Perhaps you should try some spelling variations:
introduction comprehension » introduction comprehensive, information comprehension, instruction comprehensive
program sessions » program versions, program lessons, program version
programs session » problems session
concepts case » concepts cases, concepts a, concepts chapter

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: introduction comprehension ((program sessions) OR (programs session)) concepts case~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "introduction comprehension ((program sessions) OR (programs session)) concepts case".
• Adding a wildcard symbol may retrieve word variants: introduction comprehension ((program sessions) OR (programs session)) concepts case*.